CFD analysis of biomass steam gasification in fluidized bed gasifier: A parametric study by the assessment of drying stage

2021 ◽  
pp. 1-22
Author(s):  
Husam Al-Qadasi ◽  
Gokturk M. Ozkan
Keyword(s):  
Fluidized Bed ◽  
Parametric Study ◽  
Steam Gasification ◽  
Cfd Analysis ◽  
Fluidized Bed Gasifier

scholarly journals Technological Solutions and Tools for Circular Bioeconomy in Low-Carbon Transition: Simulation Modeling of Rice Husks Gasification for CHP by Aspen PLUS V9 and Feasibility Study by Aspen Process Economic Analyzer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2006
Author(s):  
Diamantis Almpantis ◽  
Anastasia Zabaniotou
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Aspen Plus ◽  
Economic Assessment ◽  
Product Yield ◽  
Steam Gasification ◽  
Low Carbon ◽  
Simulation Tools ◽  
Fluidized Bed Gasifier ◽  
Annual Earnings

This study explored the suitability of simulation tools for accurately predicting fluidized bed gasification in various scenarios without disturbing the operational system, and dedicating time to experimentation, in the aim of benefiting the decision makers and investors of the low-carbon waste-based bioenergy sector, in accelerating circular bioeconomy solutions. More specifically, this study aimed to offer a customized circular bioeconomy solution for a rice processing residue. The objectives were the simulation and economic assessment of an air atmospheric fluidized bed gasification system fueled with rice husk, for combined heat and power generation, by using the tools of Aspen Plus V9, and the Aspen Process Economic Analyzer. The simulation model was based on the Gibbs energy minimization concept. The technological configurations of the SMARt-CHP technology were used. A parametric study was conducted to understand the influence of process variables on product yield, while three different scenarios were compared: (1) air gasification; (2) steam gasification; and (3) oxygen-steam gasification-based scenario. Simulated results show good accuracy for the prediction of H2 in syngas from air gasification, but not for the other gas components, especially regarding CO and CH4 content. It seems that the RGIBBS and Gibbs free minimization concept is far from simulating the operation of a fluidized bed gasifier. The air gasification scenario for a capacity of 25.000 t/y rice husk was assessed for its economic viability. The economic assessment resulted in net annual earnings of EUR 5.1 million and a positive annual revenue of EUR 168/(t/y), an excellent pay out time (POT = 0.21) and return of investment (ROI = 2.8). The results are dependent on the choices and assumptions made.

Calcium Looping Enhanced Biomass Steam Gasification in a Two-Stage Fluidized Bed Gasifier

2018 ◽  
Vol 32 (8) ◽  
pp. 8462-8473 ◽  
Author(s):  
Linbo Yan ◽  
Yang Cao ◽  
Boshu He ◽  
Xuezheng Li
Keyword(s):  
Fluidized Bed ◽  
Steam Gasification ◽  
Two Stage ◽  
Calcium Looping ◽  
Fluidized Bed Gasifier

scholarly journals Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

2020 ◽  
Vol 10 (8) ◽  
pp. 2931 ◽  
Author(s):  
Elisa Savuto ◽  
Jan May ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Experimental Tests ◽  
Steam Gasification ◽  
Effect Of Temperature ◽  
Bench Scale ◽  
Tar Reduction ◽  
Fluidized Bed Gasifier ◽  
Bed Material ◽  
Conversion Efficiencies

The gasification of lignite could be a promising sustainable alternative to combustion, because it causes reduced emissions and allows the production of syngas, which is a versatile gaseous fuel that can be used for cogeneration, Fischer-Tropsch synthesis, or the synthesis of other bio-fuels, such as methanol. For the safe and smooth exploitation of syngas, it is fundamental to have a high quality gas, with a high content of H2 and CO and minimum content of pollutants, such as particulate and tars. In this work, experimental tests on lignite gasification are carried out in a bench-scale fluidized-bed reactor with olivine as bed material, chosen for its catalytic properties that can enhance tar reduction. Some operating parameters were changed throughout the tests, in order to study their influence on the quality of the syngas produced, and pressure fluctuation signals were acquired to evaluate the fluidization quality and diagnose correlated sintering or the agglomeration of bed particles. The effect of temperature and small air injections in the freeboard were investigated and evaluated in terms of the conversion efficiencies, gas composition, and tar produced.

scholarly journals Steam gasification of lignite and solid recovered fuel (SRF) in a bench scale fluidized bed gasifier

2020 ◽  
Vol 114 ◽  
pp. 341-350 ◽  
Author(s):  
Elisa Savuto ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
Sergio Rapagnà
Keyword(s):  
Fluidized Bed ◽  
Steam Gasification ◽  
Bench Scale ◽  
Fluidized Bed Gasifier
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